After the crew awoke today, flight controllers at NASA's Johnson Space Center in Houston and the Russian Mission Control Center near Moscow alerted them to the problem so the astronauts could begin working to pinpoint the leak's location.
The six-member crew aboard the space station is in no danger, according to NASA, and was awakened this morning as part of their routine schedule.
Astronauts on the International Space Station (ISS) are having to deal with an air leak from a possible collision. Feustel said the crew was testing a plug that was held in place with tape, and a Russian crewmate reported that the results looked promising. After determining the astronauts weren't in danger, flight controllers allowed the Expedition 56 crew to sleep.
Controllers at NASA said their readings also showed that the pressure had stabilized, and they continued to monitor the situation.
"All station systems are stable and the crew is planning to return to its regular schedule of work on Friday".
NASA did not state what type of leak was detected.
"The leak has been isolated to a hole about two millimetres in diameter" and slowed through application of thermo-resistant tape, but a more permanent solution was in development. Larger human-made debris in space, the size of a softball or bigger, is tracked from the ground, and if it appears to threaten the International Space Station, the orbiting laboratory is maneuvered around the material.
The astronauts are now working with engineers on the ground to work out whether a more permanent fix is needed. The space station is heated and pressurized with an air mixture so that the astronauts can breathe normally, and it requires an airtight seal to ensure that the air can be continuously recycled. Roscosmos is still continuing to investigate what caused the leak.
This story will be updated.